Throttling device for hydraulic machinery.



' PATENTED MAR. 10, 1908.

0. L. TAYLOR. V

THROTTLIN-G DEVICE FOR HYDRAULIC MACHINERY. APPLIOATION mum JUNE 15. 1905.

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Nb. 881,165. PATENTED MAR. 10, 1908;

G. L. TAYLOR. THROTTLING DEVICE FOR HYDRAULIC MACHINERY.-

APPLiOATION' FILED JUNE 15, 1905;

INVENTOR n1: rmmws F'ErERs 50., \wsmucmn, 11c

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0.1.. TAYLOR.

THROTTLING DEVICE FOR HYDRAULIC MACHINERY.

APPLICATION TILED JUN 15. 1 0

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PATENTED MAR. 10, 1908.

WITNES I L @vvmvm No. 881,165. I PATENTED MAR. 10, 1908.

- (LL. TAYLOR.

THROTTLING DEVICE FOR HYDRAULIC MACHINERY.

APPLIOATION FILED JUNE15. 1905.

4 SHEETSSHEET 4.

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, machines I have shown it in connection with CLARENCE L. TAYLOR, OF ALLIANCE, OHIO,

ASSIGNOR TO THE MORGAN ENGINEERING COMPANY, OF ALLIANCE, OHIO.

THROTTLING DEVICE FOR HYDRAULIC MACHINERY.

Specification of Letters Patent.

Patented March 10, 1908.

Application filed June 15, 1905. I Serial No. 265,351.

To all whom it may concern:

Be it known that I, CLARENCE L. TAYLOR, of Alliance, in the county of Stark and State of Ohio, have invented certain new and useful Improvements in Throttling Devices for Hydraulic Machinery; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to an improvement in throttling device for hydraulic machinery, the object of the invention being to provide means for automatically cutting off the power or pressure when the machine reaches the end 0 its stroke, or when the resistance is removed, thus preventing the movable part of the machine from jumping.

With this end in view my invention consists in the parts and combination of parts as will be more fully explained and pointed out in the claims.

In the accompanying drawings, Figure 1 is a view in rear elevation partly in section of a hydraulic shear embod ing my invention. Fig. 2 is a view in vertica transverse section the inner end of the exhaust port 22 being broken away so as to show a portion of the pressure port 13 and the valve in the exhaust assage. Fig. 3 is a view in plan partly in horizontal section. Fig. 4 is a rear view'of the casting carrying the check valve and Fig. 5 is a section through same showing the check valve. I

While my improvement is applicable to hydraulic shearing punching and similar a hydraulic shear, but I desire to have it distinctly understood that I do not limit the application of the improvement to any partlcular class of machines.

1 re resents a base plate sup orted on a suitab e foundation, and to whic are bolted the side frames 2. Secured to the tops of the side frame is the top frame 3, which latter is providedcentrally with a depending cylinder 4 0 en at its top for the reception of the vertical y movable hollow piston 5. The top frame 3 projects at its rear as shown at 6, considerably below the bottom of the cylinder, and this projecting portion is rovided at its front edge with a cutting b ade 7 which latter constitutes the fixed cutter of the shear. The hollow piston 5 is mounted in the open upper end 0 the cylinder 4 and 1 is rovided at diametrically opposite sides wit projection 8, in which are secured the upper ends of the rods 9. These rods are mounted and guided in the top and side frames 3 and 2, and are secured at their lower ends to the movable shear block 10 carrying at its upper rear edge the shear blade 11. The shear blades 7 and 11 are in alinement as shown in Fig. 2, and operate in the ordinary and well known manner. In the operation of the device,'fiuid under pressure will be admitted to the cylinder within the hollow piston, and operate to elevate the latter and thelower shear block 10 connected thereto.

In all punching and shearing machines there is a tendency of the movable shear or punch to jump just as soon as the resistance is removed, and the object of my present in- 4 vention is to provide means for automatically cutting off the supply of fluid the instant the resistance has been removed, or at the instant the cutting edge of the lower shear blade reaches and passes the lane of the upper shear blade. This thrott ing device comprises a cylinder 12 secured at its lower end to the base of the cylinder 4, and is in open communication with the inlet port 13 in top ger is designed to snugly fit within the upper end of bushing and form a closure for the same when the piston is in its normal position, the body of the plunger between its ends being considerably reduced in diameter so as to permit the free assage of water up around the plunger. W en the parts are in these positions above referred to, the head 19 of the plunger 15 rests a distance below the peripheral shoulder or seat 16, somewhat greater than the distance between the cutting edges of the two shear blades.

When the water under pressure is first introduced into cylinder 12, the pressure thereof against the head 19 of plunger 18, operates other article between the blades.

to give theinitial start to the piston 5, and the shear block 10. This upward movement of the piston carries the head 20 of plunger 18 out of bushing 15 thus permitting the actuating fluid to enter cylinder 4 and hollow piston 5, and exert its full power thereagainst, thus causing the shear block 10 with its shear blade 11 to rise, and sever the plate, billet or After the cutting edge of shear blade 11 passes the cutting edge of blade 7, and aboutthe time of the'removal of the resistance to the=free up wardmovement of the shear block 10, the conical section 21 of the plunger 18 reaches the plane of the peripheral shoulder or seat 16 and gradually reduces the supply of fluid to the piston 5 and this supply is completely cut oil by the head 19 entering or engaging the shoulder or seat 16. From this it will be seen that upon the severance of the plate or billet, or when the resistance is removed, the supply of power to the piston is gradually cut ofi thus preventing the block 10 from jumping, as it would do if the supply were continued after the severance.

3 is the'casting 14 provided with'a passage way 23 communicating with the pressure port 13, and-with a passageway'24 communicating with the exhaust port 22. Passage; way 24 in casting 14, communicates with passageway 23, through port or passage'26, a downwardly closing valve 25, being located in passage-way 24 below port 26, so that when the ports 23 and 26 are filled with water under pressure'the valve 25 will beheld on its "seat.

A three or four wayvalve is connected up to port 23 of casting 14 for regulatingthe supply and exhaust.

It will be apparent that when the 'hy: draulic'valve is turned to admit water under pressure, the water thus admitted will pass into passage 23 in casting 14, and from thence.

to port 13 into cylinder 12 and elevate the hollow piston 5 and plunger 19, the pressure of water on the top of'checkvalve 25 and in passage way 26 holding the valve in its closed position. The water thus entering cylinder 12 will pass out at the top of the latter and elevate the piston and shear block. The water under pressure will also pass into and fill exhaust passage 21 in cylinder 12, passage 22 in top'frame 3, and port 24 in casting 14, valve 25, however, being prevented from rising at this time by pressure above. By now turning-the valve so as to shutoff the pressure and open the exhaust, the weight of pis:

ton 5, shear block 10 and connecting parts will cause these parts to descend and force the water out through the exhaust port 22, into port 24 in casting 14. The water entering port 24 under valve 25, lifts the latter and passes into port 26 and thence through port 23 to a three or four way valve and from the latter to the waste pipe. As the inner cylinder 12 is also filled with water, it follows that as soon as the exhaust shall have been opened, the water undervplun'ger '18 will flow out through port 13, to port orpass'a'ge way 23 and-from thence out through ."the valve thus giving a free and rapid-exhaust both might be'resorted to in the'relative-"arrange.

ment of parts herein shown and described without departing from thespirit and scope of my invention hence :I would have'it understood that I donot wishto 'confinemyselfto the exact construction" herein shown and described, but,

Having-fully described myinvention what I claim as new and'desire "to sec'urebylaetters-Patent, is

1. The combination with "a fixed 'main cylinder, a smaller cylinder secured-to the closed end of "the fixedmaincylinder and-a liquid 'supply'for the main cylinder leading to the smaller cylinder, of a'hollow :pist'on for the main cylinder, andaplunger 'carried by saidpiston and moving within thesm'aller cylinder, the said-plunger andcylinder being shaped to permit the'liquid to freelypa'ss, and enter the "main fixed cylinder except when the piston has approximately 4 reached the ends of its stroke. 3

2. The combination with a main fixed cylinder, a smaller cylindersecured to the closed end of the fixed-main cy1inder, a-nd providedwith an annular peripheralshoulder or seat, and a liquid supply for themaincylinder leading-to the smaller cylinder, ofa hollow piston for the main cylinder, "and a plunger carried by said piston andprovided with a head'of less diameter thanthe 'sm'aIler cylinder,thesaid head adapted'to cooperate with the shoulder or'seat inthe-sm' aller'cylinder for shutting off the supply of 'fluidto the larger cylinder.

3. The combination with "a main fixed cylinder, a smaller cylinder secured' to the closed end of the'fixed'maincylinderand provided with an annular peripheral shoulder or seat,"and a supply portfor themain fixed cylinder discharginginto- "the'inner cylinder, of a hollowpiston' for'the main cylinder, and a plunger carriedbythe piston and provided with an enlargedend or head adapted to cooperate withthe shoulder or seat-within the smaller cylinder for cutting off the supply of fluid-to the main cylinder.

4. The combination with a fixed main cylinder, a smaller cylinder within the main cylinder and provided with an internal peripheral shoulder or seat, and an inlet port for the main cylinder discharging into the inner cylinder, of a hollow piston for the main cylinder, and a plunger fixed to said piston and moving within the smaller cylinder, the said plunger having enlarged heads at its ends, one head adapted to normally close the free end of the smaller cylinder, and the other head adapted to cooperate with the peripheral seat or shoulder in the smaller cylinder for cutting ofi the supply of fluid to the main fixed cylinder as the piston nears the end of its up stroke.

5. The combination with a fixed main cylinder, a smaller cylinder secured to the closed end of the main cylinder and in open communication at its free end with the latter, a fluid supply port discharging into said smaller cylinder, an exhaust port, a port connecting the supply and exhaust ports and a valve in the exhaust port, of a hollow piston for the main cylinder, and a plunger carried by said piston and moving within the smaller cylinder.

6. The combination with a fixed main cylinder having an exhaust port, and an inlet or pressure port, a check valve in the exhaust port and a port connecting the exhaust and inlet ports above the check valve, of a hollow piston for the main cylinder, a smaller cylinder secured to the main cylinder and in communication with--the inlet port and a plunger carried by the piston and moving within the smaller cylinder.

7. The combination with a main cylinder, a smaller cylinder therein, the latter communicating at its free end with the main cylinder, an inlet or pressure port leading to the fixed end of the smaller cylinder, and an exhaust port the inner end of which communicates with the cylinders approximately in the plane of the free end of the smaller cylinder, of a hollow piston for the main cylinder and a plunger carried by the piston and moving within the smaller cylinder.

8. The combination with a main cylinder, a smaller cylinder therein, the latter communicating at its free end with the main cylinder, an inlet or pressure port leading to the fixed end of the smaller cylinder and an exhaust port leading from the smaller cylinder near the free end of the latter, of a hollow piston for the main cylinder, and a lunger carried by the piston and moving wit in the smaller cylinder.

In testimony whereof, I have signed this specification in the presence of two subscribing witnesses.

CLARENCE L. TAYLOR.

Witnesses: I

N. C. FETTERs, A. L. ROBERTS. 

